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Activity在onCreate和onResume中finish时,生命周期的不同表现

2023-05-19 15:05:04
共1条回复
蓓蓓

最近细看Android docs,发现finish()在不同地方的生命周期有所区别。

在Android Studio中新建Android项目,分别重写onCreate、onResume、onPause、onStop、onDestroy方法,并打印相关信息。

好显然,在onCreate中finish是跳过了onPause和onStop方法,直接执行onDestroy。

原因:开发文档中说到,Activity只有在Resumed、Paused、Stopped这三种状态下存在较长时间(即可以运行较长时间),Activity在其他状态下都是一闪而过。其中,在onResume中,Activity变为用户可见并且可以交互。因此,如果Activity不存在交互的概念(即在onCreate()中finish掉),就不会回调onPause、onStop等需要用户交互的方法。

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2023-01-01 20:58:202

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.实现ActivityLifecycleCallbacks接口,这里考虑了应用遇到异常重启的情况,[java] view plain copy print?resetVariables()方法可以重置状态。 [java] view plain copy print?package com.sohu.newsclient; import android.app.Activity; import android.app.Application; import android.os.Bundle; /** * 用于判断App是否在后台 * Created by kriszhang on 16/1/4. */ public class NewsLifecycleHandler implements Application.ActivityLifecycleCallbacks { // I use four separate variables here. You can, of course, just use two and // increment/decrement them instead of using four and incrementing them all. private static int resumed; private static int paused; private static int started; private static int stopped; public NewsLifecycleHandler(){ resetVariables(); } public void resetVariables(){ resumed=0; paused=0; started=0; stopped=0; } @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { } @Override public void onActivityDestroyed(Activity activity) { } @Override public void onActivityResumed(Activity activity) { ++resumed; } @Override public void onActivityPaused(Activity activity) { ++paused; android.util.Log.w("test", "application is in foreground: " + (resumed > paused)); } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { } @Override public void onActivityStarted(Activity activity) { ++started; } @Override public void onActivityStopped(Activity activity) { ++stopped; android.util.Log.w("test", "application is visible: " + (started > stopped)); } // If you want a static function you can use to check if your application is // foreground/background, you can use the following: public static boolean isApplicationVisible() { return started > stopped; } public static boolean isApplicationInForeground() { return resumed > paused; } public static boolean isApplicationInBackground(){ return started==stopped; } }
2023-01-01 20:58:291

收复的英语翻译 收复用英语怎么说

Recovery of English translation
2023-01-01 20:58:347

翻译成英语

骗人的,假AND假
2023-01-01 20:58:594

“突破”和“跳投”英文怎么说

突破[词典] break; break through; make a breakthrough; surmount; breach[例句]This may have been an improvement, but "breakthrough" was an overstatement。这算得上是一个改进吧,但说是“突破”就言过其实了。跳投[词典] jump shot; jumper[例句]When play resumed, Robinson hit a jumper, and jawed in Paul"s face.当比赛恢复进行,罗宾逊投中一个跳投,下巴撞到了保罗的脸。
2023-01-01 20:59:166

请翻译英文,谢谢!不要直译!

Long time no contact, have a nice holiday?The plant of this side has returned to and started the normal production. As to the last shipment send to you, I hope can receive your feedback. If there is any issues need us to take care, please let us know, so than it can be improved.Furthermore, as to the box, have you seen the picture I send to you? Whether is imilar to the figure of the box? If yes, please tell us the outside dimensions, i will quote to you?
2023-01-01 20:59:433

求英语高人2

A
2023-01-01 20:59:542

Lifecycle原理

Lifecycle是用来构建生命周期感知型组件的工具。 使得我们可以用统一的方式来监听 Activity、Fragment、Service、甚至是 Process 的生命周期变化。 Event 用于抽象 Activity/Fragment 的生命周期事件。例如,当 Activity 的 onCreate 方法被回调时就会被抽象为 ON_CREATE事件。 State 用于标记 Lifecycle 的当前生命周期状态。例如,当 Activity 即将回调 onDestory 方法时则处于 DESTROYED 状态 LifecycleOwner 接口用于标记其实现类具备 Lifecycle 对象,实现了该接口即意味着实现类具有生命周期。我们日常使用的 androidx.appcompat.app.AppCompatActivity 和 androidx.fragment.app.Fragment 均实现了该接口。 LifecycleObserver 生命周期观察者,是一个空接口,仅是用于类型标记。 LifecycleEventObserver 用于监听 Lifecycle 的生命周期变化,可以接收到生命周期事件变化。 FullLifecycleObserver 根据 Activity 的生命周期回调方法扩展了几个同名的抽象方法,可以看成是对 LifecycleEventObserver 进行更加具体的事件拆分 FullLifecycleObserverAdapter 实现了 LifecycleEventObserver 接口,用于在收到 Lifecycle 生命周期事件时转发给 FullLifecycleObserver、LifecycleEventObserver。 1,设备的系统版本号大于等于29。会向 Activity 注册一个 LifecycleCallbacks ,以此来直接获得各个生命周期事件的回调。 2,设备的系统版本号小于 29。会通过向 Activity 添加一个无 UI 界面的 Fragment(即 ReportFragment),间接获得 Activity 的各个生命周期事件的回调。 3,之所以会进行这两种情况区分,是因为 Activity.registerActivityLifecycleCallbacks 是 SDK 29 开始 android.app.Activity 新添加的方法。 activity.registerActivityLifecycleCallbacks(new LifecycleCallbacks()); Activity生命周期回调的时候会回调LifecycleCallbacks的对应生命周期方法。 dispatch方法:从Activity中取出LifecycleRegistry,调用handleLifecycleEvent方法。 直接在ReportFragment的对应生命周期中调用了dispatch去分发生命周期。 Fragment 是在其生命周期方法中直接调用了内部LifecycleRegistry的的handleLifecycleEvent进行生命周期时间分发。 LifecycleRegistry 向 Observer 发布 Event 值的触发条件有两种: 1,新添加了一个 Observer,需要向其同步 Activity 当前的 State 值。例如,当 Activity 处于 RESUMED 状态时向其添加了一个 LifecycleEventObserver ,此时就必须向 LifecycleEventObserver 同步当前的最新状态值,所以 LifecycleEventObserver 就会先后收到 CREATED、STARTED、RESUMED 三个 Event 2,Activity 的生命周期状态发生了变化,需要向 Observer 同步最新的 State 值 1,addObserver() 方法的主要逻辑是:将传入的 observer 对象包装为 ObserverWithState 类型,方便将 1,注解形式的LifecycleObserver和 2,接口实现的 LifecycleObserver,进行状态回调时的入口统一为 dispatchEvent() 方法。 2,此外,由于当添加 LifecycleObserver 时 Lifecycle 可能已经处于非 INITIALIZED 状态了,所以需要通过循环检查的方式来向 ObserverWithState 逐步下发 Event 值。 3,假设当前 LifecycleRegistry 的 mState 处于 RESUMED 状态,此时通过 addObserver 方法新添加的 LifecycleObserver 会被包装为 ObserverWithState,且初始化状态为 INITIALIZED。由于 RESUMED 大于INITIALIZED,ObserverWithState 就会按照 INITIALIZED -> CREATED -> STARTED -> RESUMED 这样的顺序先后收到事件通知 4,假设当前 LifecycleRegistry 的 mState 处于 STARTED 状态。如果 LifecycleRegistry 收到 ON_RESUME 事件,mState 就需要变更为 RESUMED;如果 LifecycleRegistry 收到 ON_STOP 事件,mState 就需要变更为 CREATED;所以说,LifecycleRegistry 的 mState 会先后向不同方向迁移 5,ObserverWithState 将外界传入的 LifecycleObserver 对象传给 Lifecycling 进行类型包装,将反射逻辑和接口回调逻辑都给汇总综合成一个新的 LifecycleEventObserver 对象,从而使得 Event 分发过程都统一为 mLifecycleObserver.onStateChanged ReportFragment 最终在向外传出 Lifecycle.Event 值时,调用的都是 LifecycleRegistry 的 handleLifecycleEvent(Lifecycle.Event) 方法,该方法会根据接收到的 Event 值换算出对应的 State 值,然后更新本地的 mState,再向所有 Observer 进行事件通知,最终还是会调用到 ObserverWithState 的 dispatchEvent 方法。 通过Lifecycling#lifecycleEventObserver生成了五种Adapter,将生命周期事件转发给它们进行分发。 1,FullLifecycleObserverAdapter(可分发FullLifecycleObserver接口和LifecycleEventObserver接口:在FullLifecycleObserverAdapter会根据event事件调用FullLifecycleObserver对应的事件方法; 调用LifecycleEventObserver.onStateChanged分发事件。 2,LifecycleEventObserver: 调用LifecycleEventObserver.onStateChanged分发事件。 3,SingleGeneratedAdapterObserver,CompositeGeneratedAdaptersObserver(通过apt生成的生命周期事件分发类),调用GeneratedAdapter.callMethods进行事件分发,GeneratedAdapter内部会根据event选择调用对应方法。 4,ReflectiveGenericLifecycleObserver(通过反射生成的生命周期事件分发类),内部持有一个CallbackInfo,通过反射收集了event-list<mathod>的map,根据event找到对应方法进行分发。
2023-01-01 21:00:051

英文翻译

Level 11的书里有翻译
2023-01-01 21:00:142

英语高手注意啦帮忙做几个填空题救命呀!

guestscomejunkscamefindexcusewearwere filledagainappears
2023-01-01 21:00:234

大学英语4自测题二:请各位老师帮下忙,万分感谢!

D.A.C.D.A.C.B.D.C.A.B.C.D.C.B
2023-01-01 21:00:381

翻译成英语

A: music annexAnnex ii: backlogAnnex iii: backlogAnnex 4: backlogAttachment 1: you have five: hello, XX performance start, performance, the performance time place XX XX, please fellow tourists will appreciate, TV crew of the national site wishing you visit!Attachment 6:2: hello, dear visitors because of XX (equipment maintenance/power/weather condition, etc.), scheduled for XX: XX points in XX staged performances, temporary cancellation of XX for your inconvenience! State TV park staff wish your visit!(3) : hello, dear visitors because of XX (equipment maintenance/power/weather condition, etc.), scheduled for XX: XX points in XX staged performances change to XX: XX in XX, XX points for your inconvenience! State TV park staff wish your visit!Annex 7:4 fellow tourists, hello! Welcome to national park, TV, in order to facilitate due to weather mutations shelter, please everybody tourist visitors to site the sequential under shelter: the tourist center etc in indoor rain. (rainy days notice)5 fellow tourists, hello! Welcome to national park, because of TV, so visitors recently snow videotapes, attention, don"t slippery feet hurt, prevent chasing. (snow days notice)[6] hello, dear visitors! Popular TV park countries. Due to the weather today, in order to ensure safety mutations visitors, please don"t stand in the slope and the visitors on the high buildings, trees, or not in the eaves, in case of lightning strikes. Thunder (advise)Annex 8 (7), fellow tourists, hello! In the park, please fire XXX friends don"t panic, according to the working personnel of command, orderly evacuation passageway and safety, thank you for your cooperation! (fire),(8), fellow tourists, hello! Welcome to national park, TV due to hardware failure zone, pavement, in order to facilitate visitors obstacles in, please fellow tourists around XXX, forget all visitors understanding, thank you for your cooperation! (the leakage, landslides, earthquake or other disaster)(9), tourist friend hello! Welcome you to visit the park state TV! Due to mechanical trouble, XXX, we can supply friend understanding! (power),(10), fellow tourists hello! In the park, please gas leak happened by friends don"t panic, staff and orderly evacuation passages from safety, thank you for your cooperation!(11) : hello, dear visitors! Welcome to TV national park! For you and your family can have a pleasant journey, please watch your children, and your belongings, in order to avoid the loss. State TV park staff wish your visit!(12) and fellow tourists hello! Welcome to TV national park! Because the area is large, if you wanted to find in the journey, please call our hotline - as soon as possible, for you will give full radio, please. Famen temple staff wish your visit!(13), fellow tourists hello! Because electricity blackout emergency, performance, please everyone audience interrupted, don"t walk around in sit and watch his belongings, lest cause unnecessary damage. We will be resumed as soon as possible, bring you inconvenience! Thank you for your cooperation. !(14) and * *, sir/madam, please come after broadcast sheet, your office door tourists are waiting for the family.(15), fellow tourists hello! Welcome to TV national park! Because of the road has tree-lined square on both sides of the sculpture shows, please fellow tourists don"t climb on you, lest cause unnecessary damage! State TV park staff wish your visit!Annex 9: backlog
2023-01-01 21:00:432

炸弹英文

深水炸弹又称深弹(英文:depth charge),是一种用于攻击潜艇的水中武器,通常装有定深引信,在投入水中后下沉到一定深度或接近目标时引爆以杀伤目标。通常由舰船或反潜飞机投放,现在它的反潜地位已慢慢地被舰载鱼雷或空投鱼雷取代。爆炸的英文释义 explode ;blast; blow up; bomb; blow back爆炸的英文例句: 马听到爆炸声受了惊。The horse took a fright at the sound of the explosion.爆炸的时间定在飞机起飞的时刻。The explosion was timed to be simultaneous with the plane"s take-off.爆炸的力量把塔炸得粉碎。The tower was blown to atoms by the force of the explosion.爆炸后经过相当一段时间,这个城镇才恢复了正常的生活秩序。After the explosion it was some time before the town resumed its everyday routines.那爆炸声一英里外也可以听到。The explosion was heard a mile away.火药是一种爆炸物。
2023-01-01 21:00:521

英语问题

问题英文
2023-01-01 21:01:015